Error: L6218E: Undefined symbol when follow the tutorial

Question

Hi All 
 I am doing a project which is base on SDK15.2 examples\proprietary_rf\gzll\gzp_dynamic_pairing\host\pca10040\blank\arm5_no_packs 
 I would like to add a timer to this project 
 so i search some answer here, and i found the tutorial 
 I do what the tutorial said step by step 
 
 but after I add the function lfclk_request(); 
 and call in the main() 
 the compile result show the error below: 
 .\_build
rf52832_xxaa.axf: Error: L6218E: Undefined symbol nrf_drv_clock_init (referred from main.o). .\_build
rf52832_xxaa.axf: Error: L6218E: Undefined symbol nrf_drv_clock_lfclk_request (referred from main.o). 
 
 but actually i have already include the nrf_drv_clock.h and app_timer.h which the tutorial said 
 
 did i lost something important before i compile the project? 
 can anyone tell me what should i do?

Einar Thorsrud · Accepted Answer

Hi, Johnson Hirota said: What should I do if I can't see NRF_CLOCK in the projects sdk_config.h? I try to add the definition which i don't define in my project but define in the tutorial project, but it comes to more errors. You can copy the clock settings from another projects sdk_config.h file. You should use something like this (note that there was a typy on my previous reply, where the _ENABLED suffix was missing from the define): // NRF_CLOCK_ENABLED - nrf_drv_clock - CLOCK peripheral driver - legacy layer //========================================================== #ifndef NRF_CLOCK_ENABLED #define NRF_CLOCK_ENABLED 1 #endif // CLOCK_CONFIG_LF_SRC - LF Clock Source // <0=> RC // <1=> XTAL // <2=> Synth // <131073=> External Low Swing // <196609=> External Full Swing #ifndef CLOCK_CONFIG_LF_SRC #define CLOCK_CONFIG_LF_SRC 1 #endif // CLOCK_CONFIG_IRQ_PRIORITY - Interrupt priority // Priorities 0,2 (nRF51) and 0,1,4,5 (nRF52) are reserved for SoftDevice // <0=> 0 (highest) // <1=> 1 // <2=> 2 // <3=> 3 // <4=> 4 // <5=> 5 // <6=> 6 // <7=> 7 #ifndef CLOCK_CONFIG_IRQ_PRIORITY #define CLOCK_CONFIG_IRQ_PRIORITY 6 #endif // Johnson Hirota said: What do you mean to include nrf_drv_clock.c to my project? Do you mean i also have to #include "nrf_drv_clock.c" in main.c? No, I just mean that nrf_drv_clock.c must be included/added to the project so that it is compiled like any other .c file in your project.

Error: L6218E: Undefined symbol when follow the tutorial

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